摘要
本文对枯萎病菌侵入黄瓜不同抗性品种的途径，以及黄瓜受侵染根部维管组织的变化进行了观察。分生孢子在幼根表皮上萌发产生菌丝，通过胞间层侵入表皮细胞，之后菌丝继续向内部生长，穿过皮层组织进入导管。受侵染的导管内相继出现壁覆盖物、侵填体及褐色物。抗病品种的壁覆盖物比感病品种的厚：侵填体由受侵染导管旁边的薄壁细胞产生，一个细胞可产生多个侵填体，并在侵填体中观察到细胞核的存在，感病品种中的侵填体发育不充分，抗病品种中的侵填体能完全堵塞导管；谒色物在感病、抗病品种中均能完全堵塞导管，对菌丝的侵入构成了较强的机械障碍。
The process of fungous infection and cytological structure changes in seedling roots from suscepti- ble and resistant cucumber cultivar. inoculated with Fusarium oxysporum f. sp. cucumerinum were studied in this paper. Fusarium spores germinated as infecting hyphae which might penetrate the host epidermal cells , pass through the cortical cell. , and then enter into the xylem vessels. After infected by the pathogen , some occlusions such as wall-coatings , tyloses and brown-like materials were formed consequently in the vesseles. The various reactions of occlusion were earlier and more extensive in re- sistant cultivar than in susceptible one. Tylose. were formed by elonged parenchyma cells and secreted from pits. Nucleus could be observed in tyloses and a parenchyma cell could produce more than one ty- loses simultaneously . The function of these occasions was to prevent the pathogen growth.
出处
《植物病理学报》
CAS
CSCD
北大核心
1997年第4期349-352,共4页
Acta Phytopathologica Sinica
基金
河南省教委资助项目
关键词
黄瓜
枯萎病菌
病理组织学
Cucumber Fusarium oxysporum f . sp. cucumerinum Histopathology .
